feat(analysis/normed_space/operator_norm): completeness of the space of operators (#2160)
feat(analysis/normed_space/operator_norm): completeness of the space of operators (#2160)

* feat(analysis/normed_space/operator_norm): completeness of the space of operators

* add some comments

Co-authored-by: Scott Morrison <625600233cb3bcab32268c17610882e0fdaed295@tqft.net>
Co-authored-by: mergify[bot] <b09a6ee808b67e98a221404e7aaa52e0398a4954@users.noreply.github.com>
leanprover-community/mathlib,leanprover-community/mathlib